Microphone problem - Mutes/cuts off on Speaker mode S6 G920W8

Hello guys,

I have looked all over the internet for a solution to this problem and tried all kinds of things but no luck yet..

The problem is that during calls, when i switch to SPEAKER mode (hands free), the microphone cuts/mutes and the other side can't hear my voice, it also doesn't work during Video calls such as messenger or Whatsup.

First i tried to Factory reset it - didn't work, Than i tried cleaning the little hole, but than the microphone completely stopped working, So i gave the phone to a repair shop, the guy changed the Charging port board which has the microphone on it, and also had to replace the screen.

Now the microphone is working but STILL the problem with speaker mode persists.

At this point i'm thinking its a firmware issue since testing the microphone goes good, i can hear my voice loud and clear, and its a new part.

Any known firmware related issues maybe ?

Appreciate any help

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